CN104901778B

CN104901778B - Method and apparatus is sended and received in wireless communication system

Info

Publication number: CN104901778B
Application number: CN201510187818.3A
Authority: CN
Inventors: 梁锡喆; 金民奎; 安俊基; 徐东延
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2009-12-17
Filing date: 2010-12-17
Publication date: 2018-07-24
Anticipated expiration: 2030-12-17
Also published as: JP2016077004A; US20190110276A1; US8634374B2; WO2011074914A2; JP2014241627A; JP5597721B2; CA2784271C; CN104901778A; CA2784271A1; MX2012006801A; KR101835329B1; US20170094648A1; JP7005446B2; AU2010330967B2; KR20120123245A; US9554377B2; RU2505945C1; AU2010330967A1; US10015784B2; US10548127B2

Abstract

Method and apparatus is sended and received in wireless communication system.The present invention is directed to a kind of wireless communication system.In particular, the present invention for it is a kind of in a wireless communication system using a multicarrier at user equipment handling control channel method and its device, the described method comprises the following steps：Receiving step receives multiple search spaces, wherein each search space includes that the candidate and each search space of multiple control channels is corresponding with corresponding carriers；And monitoring step, the control channel of the monitoring for the control channel is candidate, wherein if the control channel candidate has common information size on two or more search spaces, the control channel can be received via any one of the two or more search spaces.

Description

Method and apparatus is sended and received in wireless communication system

The application is that application No. is 201080057739.6 application for a patent for invention (international application no for original bill：PCT/ KR2010/009076, the applying date：On December 17th, 2010, denomination of invention：The device and method for avoiding control channel from blocking) Divisional application.

Technical field

The present invention is directed to wireless communication system, more particularly, for the device and method for avoiding control channel from blocking.

Background technology

Wireless communication system diversification, to provide various types of communication services, such as voice service or data clothes Business.In general, wireless communication system is the multiple access system that can share free system resources (bandwidth, transmission power etc.), with Just the communication with multi-user is supported.The example of multiple access system includes CDMA (CDMA) system, frequency division multiple access (FDMA) System, time division multiple acess (TDMA) system, orthogonal frequency division multiple access (OFDMA) system, single-carrier frequency division multiple access (SC-FDMA) system Deng.

Invention content

Technical problem

It is an object of the present invention to by avoiding control channel from hindering in the wireless communication system for supporting carrier wave polymerization The method and apparatus of plug the problems of solve.

It is another object of the present invention to be solved by effectively carrying out the method and apparatus of blind decoding to control channel The problems of.

A further object of the present invention is formulated to the method effectively to send control channel by constructing search space The problems of solved with device.

Technical solution

In the first aspect of the present invention, one kind is provided in a wireless communication system using a multicarrier in user equipment The method that place receives control channel, wherein this approach includes the following steps：Receiving step receives multiple search spaces, wherein often A search space includes multiple control channels candidate (control channel candidate) and each search space is equal It is corresponding with corresponding carriers；And monitoring step, the control channel of the monitoring for the control channel is candidate, wherein if institute State control channel candidate has common information size on two or more search spaces, then can via described two or Any one of more search spaces receive the control channel.

In the second aspect of the present invention, it provides a kind of suitable for receiving control in a wireless communication system using a multicarrier The user equipment of channel processed, the wherein user equipment include：Radio frequency (RF) unit；And processor, wherein the processor is suitable In receiving multiple search spaces, wherein each search space include the candidate and each search space of multiple control channels with Corresponding carriers correspond to, and the control channel candidate for being suitable for monitoring for the control channel, wherein if described Control channel candidate has common information size on two or more search spaces, then can be via described two or more Any one of multiple search spaces receive the control channel.

Preferably, if the control channel candidate is on the two or more search spaces have it is described common Information size is then based on it is assumed hereinafter that executing the monitoring step：It can be via in the two or more search spaces It is candidate that any one receives the control channel with the common information size.

Preferably, the control with the common information size is distinguished using CIF (multi-carrier indicator field) values Channel candidate processed.

Preferably, if the control channel candidate has different information sizes on the multiple search space, only The control channel is received via corresponding to a search space of the relevant carrier wave of the control channel.

Preferably, the multiple search space is received via same carrier wave, and the control channel includes being used to indicate CIF (multi-carrier indicator field) value of correlated carrier wave.

Preferably, (the cyclic redundancy schools CRC are carried out to the control channel using RNTI (radio network temporary identifier) Test) scrambler.

Preferably, the multiple search space is the specific search space of user equipment.

Preferably, described information size includes DCI (down link control information) Payload size.

Preferably, the monitoring step includes being decoded to each control candidate for the control channel.

Preferably, the above further includes executing operation according to the control channel.

In the third aspect of the present invention, one kind is provided in a wireless communication system using a multicarrier in network node The method that place sends control channel, wherein this approach includes the following steps：Multiple search spaces are constituted, wherein each search space Include that the candidate and each search space of multiple control channels is corresponding with corresponding carriers；And via the multiple search sky Between send the control channel, wherein if the control channel candidate have on two or more search spaces it is common Information size then can send the control channel via any one of the two or more search spaces.

In the fourth aspect of the present invention, provide a kind of suitable for sending control in a wireless communication system using a multicarrier The network equipment of channel processed, the wherein network equipment include：Radio frequency (RF) unit；And processor, wherein the processor is suitable In execution following steps：Multiple search spaces are constituted, wherein each search space includes that multiple control channels are candidate and every A search space is corresponding with corresponding carriers；And the control channel is sent via the multiple search space, wherein if The control channel candidate has common information size on two or more search spaces, then can be via described two Or more any one of search space send the control channel.

Preferably, if the control channel candidate is on the two or more search spaces have it is described common Information size, then can be sent via any one of the two or more search spaces has the common information The control channel of size is candidate.

Preferably, if the control channel candidate has different information sizes on the multiple search space, only The control channel is sent via corresponding to a search space of the relevant carrier wave of the control channel.

Preferably, the multiple search space is sent via same carrier wave, and the control channel includes being used to indicate CIF (multi-carrier indicator field) value of correlated carrier wave.

Advantageous effect

According to the present invention it is possible to avoid supporting the control channel obstruction in the wireless communication system of carrier wave polymerization.In addition, can To perform effectively blind decoding to control channel.Furthermore it is possible to effective constitution search space.

Description of the drawings

Included attached drawing is for providing a further understanding of the present invention, and accompanying drawing shows embodiment of the present invention, And with the principle for illustrating embodiments of the present invention together with specification.In the accompanying drawings：

Fig. 1 is the figure of the example arrangement for the radio frames for showing the 3rd generation partner program (3GPP) system.

Fig. 2 is the figure for showing the resource grid for downlink time slots.

Fig. 3 is the figure for the example arrangement for showing descending chain circuit frame.

Fig. 4 is the flow chart for showing to constitute the processing of PDCCH at base station (BS).

Fig. 5 is the flow chart for showing to handle the processing of PDCCH at user equipment (UE).

Fig. 6 is the figure for the example arrangement for showing uplink subframe.

Fig. 7 is the figure for showing carrier wave polymerization (CA) communication system.

Fig. 8 is the figure for showing cross-carrier scheduling.

Fig. 9 is the side for the composition search space for showing the network equipment (for example, base station) according to the embodiment of the present invention The figure of method, wherein if control channel candidate is in N number of search space (N<=M) on have common information size, then can be via N Any one of a search space sends the control channel for being assigned to special user equipment.

Figure 10 is the figure for the method for showing user equipment handling control channel according to the embodiment of the present invention, wherein such as Fruit control channel candidate is in N number of search space (N<=M) on have common information size, then can be via in N number of search space Any one reception be assigned to the control channel of user equipment.

Figure 11 A, Figure 11 B and Figure 12 are to show according to the embodiment of the present invention, the case where monitoring DL CC using one The lower exemplary figure for constituting search space.

Figure 13 is to show according to the embodiment of the present invention, and it is empty to constitute search using multiple monitoring DL CC Between exemplary figure.

Figure 14 to Figure 15 is to show according to the embodiment of the present invention, in the feelings that the number of executable blind decoding is restricted The exemplary figure of search space is constituted under condition.

Figure 16 is to show uniformly to constitute the exemplary of search space using DCI sizes according to the embodiment of the present invention Figure.

Figure 17 to Figure 20 is the example for showing the search space according to the embodiment of the present invention under carrier wave polymerization state Figure.

Figure 21 to Figure 22 is to show according to the embodiment of the present invention, the figure of the simulation result at shared search space.

Figure 23 is the figure for showing can be applied to the BS of embodiments of the present invention and UE.

Specific implementation mode

It can be in such as CDMA (CDMA) system, frequency division multiple access (FDMA) system, time division multiple acess (TDMA) system, orthogonal It is utilized in the various wireless access systems of frequency division multiple access (OFDMA) system or single-carrier frequency division multiple access (SC-FDMA) system etc Following technology.Cdma system can be realized as following wireless technology：Such as general land wireless access (UTRA) or CDMA2000. TDMA system can realize following wireless technology：Such as global system for mobile communications (GSM)/General Packet Radio Service (GPRS)/ The enhanced data-rates (EDGE) of GSM evolution.OFDMA system can be realized as following wireless technology：Such as 802.11 (Wi- of IEEE Fi), IEEE802.16 (WiMAX), IEEE 802-20 or E-UTRA (UTRA of evolution).UTRA systems are universal mobile communications The part of system (UMTS) standard.Third generation partner program long term evolution (3GPP LTE) communication system is E-UMTS The part of (UMTS of evolution) standard uses OFDMA system, and uses SC- in the uplink in the downlink FDMA systems.LTE-A (advanced) is the evolution version of 3GPP LTE.

In order to keep description clear, 3GPP LTE/LTE-A are will focus on, but the technical scope of the present invention is without being limited thereto.It answers Work as attention：Disclosed specific term is proposed for facilitating description and more fully understanding the purpose of the present invention in the present invention , and in the technical scope of the present invention or spirit, these terms can be replaced with other terms.

Fig. 1 shows the example arrangement of radio frames.

Referring to Fig.1, radio frames include 10 subframes.One subframe includes two time slots in time domain.Send a subframe Time be defined as transmission time interval (TTI).For example, subframe can be with the length of 1 millisecond (ms), and at one Gap can be with 0.5 millisecond of length.In time domain, a time slot includes multiple orthogonal frequency division multiplexing (OFDM) symbol.Due to 3GPP LTE use OFDMA in the downlink, and therefore, OFDM symbol is for indicating a symbol period.OFDM symbol also may be used Referred to as SC-FDMA symbols or symbol period.Resource block (RB) is resource allocation unit, and includes multiple in one time slot Continuous subcarrier.The structure of radio frames is shown merely for exemplary purpose.Thus, the quantity or son of the subframe that radio frames include The quantity for the OFDM symbol that the quantity or time slot for the time slot that frame includes include can be changed in various ways.

Fig. 2 shows the resource grids for a downlink time slots.

With reference to Fig. 2, downlink time slots include multiple OFDM symbols in time domain.As an example, there has been described under one Uplink time slots include 7 OFDM symbols, and a resource block (RB) includes 12 subcarriers in frequency domain.However, this hair It is bright without being limited thereto.Each element on resource grid is referred to as resource element (RE).One RB includes 12x7 RE.The downlink The quantity N for the RB that chain time gap includes^DLDepending on downlink transmission bandwidth.The structure of uplink time slot can be with downlink chain The structure of channel time slot is identical.

Fig. 3 shows the example arrangement of down link structure.

With reference to Fig. 3, most 3 OFDM symbols of the front of the first time slot and the control for being assigned with control channel in subframe Region processed corresponds to.Remaining OFDM symbol is corresponding with the data area to be dispatched for having Physical Downlink Shared Channel (PDSCH). The example of the downlink control channel used in 3GPP LTE includes：Physical control format indicator channel (PCFICH), object Manage down control channel (PDCCH), Physical Hybrid ARQ Indicator channel (PHICH) etc..PCFICH is accorded in the first OFDM of subframe It is number upper to send, and carry with for the related information of the transmission quantity of OFDM symbol of control channel in subframe.PHICH is pair Uplink send response and carry HARQ responses (ACK)/negative response (NACK) signal.The control sent by PDCCH Information processed is referred to as down link control information (DCI).DCI includes uplink or downlink schedule information or including being directed to The uplink of arbitrary UE groupings sends (Tx) power control command.

PDCCH can carry the transformat of downlink sharied signal channel (DL-SCH) and resource allocation, uplink are shared The resource allocation information of channel (UL-SCH) is believed with the related paging information of paging channel (PCH), system related with DL-SCH The resource allocation of the top level control message of breath, the random access response such as sent on PDSCH etc is grouped for arbitrary UE The activation etc. of the one group of Tx power control command, Tx power control commands, internet voice protocol (VoIP) of interior single UE.It can be with Multiple PDCCH are sent in control area.UE can monitor multiple PDCCH.In one or more continuous control channel elements (CCE) PDCCH is sent on condensate (aggregation).CCE is used to PDCCH and provides the state based on wireless channel Code rate assignment of logical unit.It is corresponding that CCE is grouped (REG) with multiple resource elements.The format of PDCCH and available The bit number of PDCCH is determined according to the quantity of CCE and by the incidence relation between the code rate of CCE settings.BS roots PDCCH formats are determined according to the DCI that will be sent to UE, and cyclic redundancy check (CRC) is attached to control information.According to institute The purposes of the person of having or PDCCH cover CRC using unique identifier (being referred to as radio network temporary identifier (RNTI)) Code.If PDCCH is used for particular UE, the unique identifier (for example, cell-RNTI (C-RNTI)) of UE can be arrived by mask CRC.Alternatively, if PDCCH is used for paging message, Paging Indicator identifier (for example, paging-RNTI (P-RNTI)) can With by mask to CRC.If PDCCH is used for the system information (system information block that more particularly, will be described below (SIB)), then system information identifier and system information RNTI (SI-RNTI) can be carried out by mask to CRC.In order to indicate to make For the random access response of the response of the random access lead code to sending UE, random access-RNTI (RA-RNTI) can be by mask To CRC.

PDCCH carries the message for being referred to as down link control information (DCI), which includes being grouped for UE or UE Assignment of resources and other control information.In general, multiple PDCCH can be sent in subframe.Use one or more so-called controls Channel Elements (CCE) processed send each PDCCH, wherein each CCE and nine group of be referred to as resource element grouping (REG) four Physical resource elements correspond to.Four QPSK symbols are mapped to each REG.The resource element that reference mark occupies is not included In REG, indicate that the sum for giving REG in OFDM symbol depends on whether that there are cell-specific reference signals.The concept of REG (that is, being mapped with the grouping of four resource elements) is also used for other downlink control channels (PCFICH and PHICH).Branch Four PDCCH formats are held, as listed in table 1.

【Table 1】

CCE is numbered and is used continuously, and for simplifying decoding process, has the PDCCH by the CCE formats formed It can only be started with the CCE for numbering the multiple equal to n.It is logical for sending the quantity of CCE of specific PDCCH according to channel condition It crosses base station and is determined.For example, if intending to be used for PDCCH that there is good downlink channel (for example, close to base station) UE, then a CCE may be sufficient.However, for the UE with bad channel (for example, near cell boarder), then 8 CCE may be needed, in order to realize enough robustness.In addition, the power grade of adjustable PDCCH is with match channels item Part.

The method that LTE is used is to define one group of limited position CCE for each UE in the place that can place PDCCH.UE This group of position CCE of its PDCCH, which can be found, can be considered as ' search space '.In LTE, for each PDCCH formats, search Space has different size.In addition, individually special (UE- is specific) space and public search space, wherein dedicated search are empty for definition Between be individually configured for each UE, and whole UE knows the range of public search space.Pay attention to：For giving UE, specially It can be overlapped with public search space.Using the search space of this kind of very little, in stator frame, base station is likely to not find CCE resources for sending from the desired PDCCH in base station to whole UE, because of some allocated positions CCE, remaining CCE Position is not in the search space of particular UE.In order to reduce the possibility that this obstruction continues to next subframe to the maximum extent Property, the specific frequency hop sequences of UE- are applied to the starting position in dedicated search space.Public search space and dedicated search space Size is listed in table 2.

【Table 2】

In order to keep the control to the calculated load caused by the sum that blind decoding (BD) is attempted, not requiring UE while search The DCI format that rope all defines.In general, in dedicated search space, UE will always search for format 0 and 1A, both format 0 and 1A It is distinguished with same size and by the label in message.In addition it may require that the further format of UE receptions (that is, 1,1B or 2, The PDSCH sending modes configured depending on base station).In public search space, UE will search for format 1A and 1C.In addition, UE It can be configured to search for format 3 or 3A, format 3 or 3A have size identical with format 0 and 1A, and can be by having with not It is distinguished with the CRC of (public) mark (rather than with UE- specific identifiers) scrambler.The sending mode that multi-antenna technology is configured It is listed below with the information content of different DCI formats.

Sending mode

Sending mode 1：It is sent from single antenna port

Sending mode 2：Send diversity

Sending mode 3：Open-Loop Spatial Multiplexing

Sending mode 4：Closed-Loop Spatial Multiplexing

Sending mode 5：Multiuser MIMO

Sending mode 6：1 precoding of closed loop order

Sending mode 7：It is sent using UE- specific reference signals

DCI format

Format 0：The resource authorization (uplink) that PUSCH is sent

Format 1：The assignment of resources (sending mode 1,2 and 7) that single codeword PDSCH is sent

Format 1A：The compact signaling (all mode) of the assignment of resources of single codeword PDSCH

Format 1B：Use the compact assignment of resources (pattern 6) of the PDSCH of 1 closed loop precoding of order

Format 1C：The closely assignment of resources (for example, paging/broadcast system information) of PDSCH

Format 1D：Use the compact assignment of resources (pattern 5) of the PDSCH of multiuser MIMO

Format 2：The assignment of resources (pattern 4) of PDSCH for closed loop MIMO operation

Format 2A：The assignment of resources (pattern 3) of PDSCH for open loop MIMO operation

Format 3/3A：With 2 bits/1 bit power adjust PUCCH and PUSCH power control command

More than considering, UE will be required to be performed both by most 44 BD in any subframe.This does not include with different crc value schools Same message is tested, which only needs the added technique complexity of very little.

With reference to Fig. 4, according to DCI format, BS generates control information.BS can according to the control information that will be sent to UE come from Multiple available DCI formats (DCI format 1,2 ... and N) in selection one.In step S410, by following for error-detecting Ring redundancy check (CRC) is attached to the control information generated according to each DCI format.According to the purposes of the owner or PDCCH, profit Mask is carried out to CRC with radio network temporary identifier (RNTI).In other words, using identifier (for example, RNTI) to PDCCH into Row CRC scramblers.

Table 3 shows to carry out PDCCH the example of the identifier of mask.

【Table 3】

If using C-RNTI, interim C-RNTI or semi-durable C-RNTI, PDCCH is carried to be believed for the control of particular UE Breath；If using other RNTI, PDCCH carries the common control information received by whole UE in cell.In the step s 420, Channel coding is executed for the control information that attached CRC, to generate coded data.In step S430, basis point is executed Task the rate-matched of the CCE polymerization grades of PDCCH formats.In step S440, modulation encoded data, to generate modulation symbol Number.The CCE polymerization grades for constituting the modulation symbol of a PDCCH can be any one of 1,2,4 and 8.In step S450, Modulation symbol is mapped to physical resource elements (RE).

With reference to Fig. 5, in step S510, UE carries out demapping according to CCE to physics RE.In step S520, due to UE The CCE polymerization grades of received PDCCH are not known, therefore UE is performed both by demodulation on each CCE polymerization grades.In step In S530, UE executes the matching of rate solution for the data of demodulated gained.The DCI lattice for controlling information are received since UE does not know Formula (or DCI Payloads size), therefore execute the matching of rate solution for DCI format (or DCI Payloads size).In step In S540, the data through rate solution matching gained are directed to according to code check and execute channel decoding, and check (CRC), to detect mistake Accidentally.If not detecting mistake, then it represents that UE detects the PDCCH of own.If detecting mistake, UE is for other CCE polymerization grades or other DCI formats (or DCI Payloads size) continuously perform blind decoding.In step S550, detect The UE of the PDCCH of own removes CRC from the data of decoded gained, to obtain control information.

Multiple PDCCH for multiple UE can be sent in the control area of same subframe.BS does not provide instruction to UE PDCCH is located at the information of the position in control area.Therefore, UE monitors one group of PDCCH candidate in subframe and finds own PDCCH.Term " monitoring " indicates that UE is decoded received PDCCH candidates according to the trial of corresponding DCI format.This is claimed Make blind decoding (blind Detecting).By blind decoding, UE is performed simultaneously the identification of the PDCCH to being sent to UE and to by corresponding The decoding for the control information that PDCCH is sent.For example, in the case where carrying out solution mask to PDCCH using C-RNTI, without CRC Error detection indicates that UE detects the PDCCH of own.

In order to reduce the expense of blind decoding, the quantity of DCI format is arranged to the control information than using PDCCH transmissions The quantity of type is few.DCI format includes multiple and different fields.The bit of the type of field, the quantity of field and each field Quantity changes according to DCI format.In addition, being changed according to DCI format with the size of the matched control information of DCI format.It is special Determine DCI format and can be used for sending two kinds of control information.

Table 4 shows the example of the control information transmitted by DCI format 0.The bit length of following field is exemplary Property rather than it is restrictive.

【Table 4】

Tag field is for distinguishing format 0 and format 1A.That is, DCI format 0 and DCI format 1A are having the same effectively negative It lotus size and is distinguished by tag field.Resource block is assigned and the bit length of frequency-hopping resource allocation field can be according to frequency hopping PUSCH or non-hopping PUSCH variations.Resource block for non-hopping PUSCH is assigned and frequency-hopping resource allocation field is to one The resource allocation of the first time slot in uplink subframe providesA bit.It indicates on one The quantity for the RB that uplink time slots include, and the uplink transmission bandwidth depending on being arranged in cell.Therefore, DCI lattice The Payload size of formula 0 can change according to uplink bandwidth.DCI format 1A includes the field assigned for PDSCH, and And the Payload size of DCI format 1A can change according to downlink bandwidth.DCI format 1A provides reference to DCI format 0 Information bit size.Therefore, if the quantity of the information bit of DCI format 0 is fewer than the quantity of the information bit of DCI format 1A, " 0 " is then attached to DCI format 0, until the Payload size of DCI format 0 becomes the Payload size with DCI format 1A Until equal.The filling field of DCI format is filled with " 0 ".

Fig. 6 is the figure of the example arrangement for the uplink subframe for showing to use in LTE system.

With reference to Fig. 6, uplink subframe includes multiple time slots (for example, two).Each time slot may each comprise SC-FDMA symbols Number, the quantity of the SC-FDMA symbols changes according to CP length.For example, in the case of conventional CP, a time slot may include 7 SC-FDMA symbols.In frequency domain, uplink subframe is divided into data area and control area.Data area includes PUSCH and the data-signal for being used to send such as voice etc.Control area includes PUCCH and controls information for sending. PUCCH includes the RB at the both ends positioned at data area on frequency axis to (for example, m=0,1,2,3), and is jumped between time slot Jump.It includes HARQ ACK/NACK, channel quality information (CQI), precoding matrix indicators (PMI) and order instruction to control information (RI)。

With reference to Fig. 7, multiple uplink/downlink component carriers (CC) are polymerizable to support broader uplink Road/downlink bandwidth.CC can be continuous or discontinuous in frequency domain.The bandwidth of CC is independently set.The number of UL CC The amount asymmetric CA different with the quantity of DL CC is also possible.Control information can be arranged to only be sent out by specific CC It send/receives.Such specific CC can be referred to main CC, remaining CC can be referred to time CC.For example, if using cross-carrier scheduling (or across CC scheduling) can then be sent the PDCCH for downlink assignments by DL CC#0, and be sent accordingly by DL CC#2 PDSCH.Term " CC " can be replaced (for example, carrier wave, cell etc.) with other equivalent terms.

For being dispatched across CC, it is contemplated that introduce multi-carrier indicator field (CIF).Configuration in PDCCH with the presence or absence of CIF can With by high-level signaling (for example, RRC signaling) semi-statically and UE- specifically (or UE grouping specifically) enables.PDCCH is sent Baseline be summarized as follows.

■ CIF disablings：PDCCH on DL CC assigns PDSCH resources on same DL CC and in singular link UL CC On PUSCH resources

Without CIF

It is identical as LTE PDCCH structures (identical coding, the identical resource impact based on CCE) and DCI format

■ CIF are enabled：CIF can be used to assign in one of the DL/UL CC of multiple polymerizations for PDCCH on DL CC PDSCH or PUSCH resources.

The LTE DCI formats extended using CIF

- CIF (if being configured) is fixed x bit fields (for example, x=3)

- CIF (if being configured) position is fixed, but regardless of DCI format size

Reuse LTE PDCCH structures (identical coding, the identical resource impact based on CCE)

It can configure across CC assignment of resources when DCI format has identical or different size both of these case

The specific CIF of the case where for same DCI format size

It will determine in the case where DCI format is of different sizes whether include CIF

BD sums will have the upper limit.

There are CIF, it is therefore desirable to, base station can assign PDCCH monitoring DL CC groups, to reduce BD in the sides UE Complexity.The CC groups are a parts of entire polymerization DL CC, and UE only executes the PDCCH's for UE scheduling in the group Detection/decoding.In other words, in order to dispatch the PDSCH/PUSCH for UE, base station only monitors DL CC groups to send by PDCCH PDCCH.PDCCH monitorings DL CC groups can be arranged to UE specifically or UE groupings are specific or cell is specific.

Fig. 8 shows the example for having polymerize the DL subframe of 3 DL CC, and DL CC A are configured as PDCCH monitorings DL CC.If CIF is desired CIF, according to following LTE PDCCH principles, each DL CC can be in the case of no CIF Only send the PDCCH being scheduled to the PDSCH of each DL CC.On the other hand, if CIF by UE it is specific (or UE be grouped it is special Fixed or cell is specific) high-level signaling and be activated, then by using CIF, only DL CC A are transmittable not only to DL CC A's The PDCCH that PDSCH is scheduled but also is scheduled to the PDSCH of other CC.Pay attention to：It is being not configured as PDCCH monitorings On the DL CC B and DL CC C of DL CC, PDCCH is not sent.Term " PDCCH monitors DL CC " available equivalents term replaces, all Such as monitor carrier wave, monitoring cell, server carrier, serving cell.

Example

If be not provided in CA systems across scheduling (cross-scheduling), only send and use via corresponding carrier wave In the PDCCH of specific carriers.For example, referring to Fig. 7, if non-across the CC scheduling of setting, is only sent via DL CC0 and be used for DL The PDCCH of CC0/UL CC0.Therefore, it is present in DL CC0 only for the PDCCH search space of DL CC0/UL CC0.That is, PDCCH search space is constituted to each carrier wave and only sends each PDCCH search space via corresponding DL CC.

However, as shown in figure 8, if provided with across CC scheduling (that is, enabling CIF), monitors DL CC and do not merely have to send There is PDCCH associated with monitoring DL CC and wants that PDCCH associated with other carrier waves must be sent.That is, monitoring DL CC (DL CC A) must send all PDCCHs associated with DL CC A, DL CC B and DL CC C.Therefore, monitoring DL CC (DL CC A) must include PDCCH search space associated with DL CC A, PDCCH associated with DL CC B search skies Between and PDCCH search space associated with DL CC C.If CIF is by setting as described above, due to must be in a DL Multiple PDCCH search spaces defined in CC, therefore can occur due to limited PDCCH resource and execute the increase of blind decoding number Caused by PDCCH obstruction.PDCCH obstructions indicate the PDCCH for corresponding carrier wave dispatch due to limited PDCCH resource and by To limitation.It is that PDCCH corresponding with each carrier wave is searched for example, if multiple PDCCH search spaces defined in a carrier wave The available resources in rope space are since limited PDCCH resource may be restricted, and thus PDCCH assigning positions may be by Limitation or PDCCH assignments may be impossible.

Therefore, if being provided with CIF, a kind of solution PDCCH is needed to block and the increased method of blind decoding number.For This can differently redefine PDCCH search space in monitoring DL CC with conventional method.That is, redefinable PDCCH is searched Rope space is to be suitble to the management dispatched across CC.For example, PDCCH search space can be defined over a number of carriers.However, if PDCCH search space is redefined, then problematic in terms of with the backward compatibility of legacy system (for example, LTE).In addition, Even if due in identical format, the Payload size of traditional DCI changes also according to carrier band, therefore in order to unified DCI is defined in PDCCH search space, needs to change DCI structures.

For this purpose, the present invention propose it is a kind of assuming that defining the feelings of PDCCH search space on the basis of each carrier wave Under condition, solve the method that PDCCH blocks and reduces the number for executing blind decoding.In more detail, the present invention proposes one kind and exists The method that the search space for blind decoding is constituted in the case of having polymerize multiple CC and across CC scheduling being carried out.It can be used and insert Enter the CIF into PDCCH to execute across CC scheduling.

Hereinafter, embodiments of the present invention be will be described in detail with reference to the accompanying drawings.As described above, the sending mode of the CC of polymerization It can be independently set and the bandwidth that every CC assigns CC can be directed to, thus the sending mode for the CC polymerizeing can be mutually the same or not Together.In the whole CC polymerizeing for every UE (grouping), one or more DL CC can be arranged to for UE's (grouping) PDCCH monitors DL CC.PDCCH monitorings DL CC are arbitrarily defined, in order to indicate for sending the load dispatched across CC with basis The DL CC of the corresponding multiple PDCCH search spaces of wave.PDCCH monitorings DL CC can be replaced with other equivalent terms.For example, term " PDCCH monitors DL CC " available equivalent terms replacement for such as monitoring carrier wave, monitoring cell, server carrier, serving cell.

For convenience, although the PDSCH scheduling of DL CC is shown in the accompanying drawings, the present invention can equally answer The PUSCH of UL CC for being linked with DL CC is dispatched.For convenience, although CCE polymerizations etc. are shown in the accompanying drawings Grade is 1, but the present invention can be applied to the case where CCE polymerization grades are other values (for example, 2,4 or 8) same or likely.To the greatest extent Pipe is assumed similarly execute two for every PDCCH candidates with traditional LTE system with for the whole circumstances in the present invention The BD of a DCI format, but the BD of executable one or three or more DCI formats for being directed to every PDCCH candidates.For Convenient purpose, it is of the invention although the quantity that DL CC are shown in the accompanying drawings symmetrical CA identical with the quantity of UL CC It can be applied to the quantity of the DL CC asymmetric CA different from the quantity of UL CC same or likely.For convenience, to the greatest extent Pipe shows the case where DL CC and UL CC are linked in a manner of corresponding, but the present invention can be applied to DL same or likely The case where CC and UL CC are linked with many-one corresponded manner or one-to-many corresponded manner.

Embodiment 1：Search space is constructed according to information (for example, DCI)

In the method, shared to have if cross-carrier scheduling is feasible in the state of having polymerize multiple carrier waves The search space of the control information of same size.In other words, with carry out dividing on each carrier basis opposite, have identical big The search space of small control information is polymerize.Therefore, can be executed in identical unified search space to carrier wave phase The monitoring of control information with same size in associated control information.It is used on the contrary, being divided on the basis of each carrier wave Search space with different size of control information.Therefore, only in search space corresponding with corresponding carriers execute to There is the monitoring of different size of control information in control information associated with carrier wave.

According to this method, if the search space of the control information with same size exists, can will be used to monitor control Being dimensioned to for the search space of information processed is big.It is thus possible to improve control channel scheduling degree of freedom and can solve The problem of control channel is blocked.

Fig. 9 is the method for showing to send control channel to particular UE at BS.

With reference to Fig. 9, BS constitutes multiple search spaces (S910).Each search space include multiple control channels it is candidate and Each search space is defined for each carrier wave (for example, CC).It can be according to the PDCCH search space structure of traditional LTE system The definition of the search space for every CC is executed at method.The PDCCH search space for traditional LTE system can be passed through The combination of parameter and CIF value obtains the parameter of the search space for every CC (for example, Hash pattern (hashing Pattern), position, size etc.).

Multiple search spaces include the specific search spaces UE or public search space, and preferably include the specific search of UE Space.Control channel includes PDCCH, and control channel candidate includes PDCCH candidates.Control channel carries various control information, And various control information formats type/contents according to the control information and exist.Hereafter, BS is sent via multiple search spaces Control channel (S920) for particular UE.Control channel (or control information) can carry identifier, in order to indicate particular UE. Identifier includes RNTI, for example, C-RNTI or SPS-RN TI.Identifier can be used to carry out control channel (or control information) Scrambler.For example, BS can send the PDCCH for having carried out CRC- scramblers with C-RNTI to UE.

It is to constitute multiple search spaces on identical DL CC if being provided with cross-carrier scheduling.It can be in control channel It is interior to execute cross-carrier scheduling using CIF.CIF can have the typical value of the DL/UL CC couple of instruction link (for example, DL CC instructions Value) or the independent value for indicating DL CC or UL CC.CIF can be indicated with absolute indices or relative indexing (for example, offset).

Search space can be constituted to, DL CC or UL CC for the DL/UL CC of each link.Search space is in logic It can be continuous or can be independently set in index, and search space can partly or wholly overlap each other.With it is every The size of the corresponding search space of a carrier wave (or CIF) can be confirmed as the maximum with the PDCCH that can be sent via search space The proportional weight or whole sizes of search space of being either given of quantity can be identical.With each carrier wave (or CIF) in corresponding search space, a control information format for an every DL CC or UL CC can be set, or can be arranged For two or more control information formats of an every DL CC or UL CC.Such as LTE system can be set in search space DCI format 0/lA etc DL/UL common control information formats.The type for the control information format being arranged in search space It can be changed according to sending mode (for example, MIMO mode).

When constructing search space, if there is the control channel format with same size in multiple search spaces (or no matter format has the control information of same size), then share the search space of corresponding control channel format.If one The quantity of the search space constituted on a carrier wave is (M>2) N (N can, then be shared<=M) a search space.Each control can be directed to Channel format (no matter or for each control information size of format) determines the shared/not shared of search space or searches for sky Between quantity.Therefore, if constitute search space for each carrier wave but exist with same size control format (or The control information with same size regardless of format), then search space is unified.It in the case, can be via N number of search sky Between any one of send for related with one in the carrier wave (or CIF) corresponding to the N number of search space being shared UE control channel.That is, can be sent in via any one of N number of search space on N number of search space with identical The control channel of size is candidate.In the case, the control with same size is distinguished using CIF (multi-carrier indicator field) values Channel candidate processed.

On the contrary, if the size of control channel format is different for each search space, not shared control channel lattice The search space of formula.In the case, it can only be sent for UE's via search space corresponding with corresponding carriers (or CIF) Control channel.That is, it is candidate only to send the control channel with identical CIF via a search space corresponding with CIF.

For example, BS can constitute search space for every CC and compare DCI (format) size for whole CC.Such as There is the DCI (format) with same size in fruit, then BS can unify the search space of DCI (format), to constitute searching for extension Rope space.Therefore, it (rather than via corresponding search space) can be sent via any PDCCH candidates in expanded search space PDCCH for the DCI (format) with same size.In the case, it is distinguished using CIF (multi-carrier indicator field) values PDCCH in expanded search space is candidate.

Figure 10 is the exemplary figure for showing the handling control channel (for example, PDCCH) at UE.The process of Figure 10 and Fig. 9's Process is corresponding and the description of reference Fig. 9 is described in detail.

0, UE receives multiple (M referring to Fig.1:M >=2) search space (S1110).It is empty that each search is defined for each carrier wave Between.Hereafter, UE monitors the control channel candidate in search space, to find the control channel (S1120) for being dispatched to UE.At monitoring Reason includes carrying out blind decoding to each control channel candidate.Hereafter, UE can execute operation according to the control channel for being dispatched to the UE (S1130)。

It, can be via at this point, if control channel candidate information size having the same on a search space N (N≤M) Any one of N number of search space is received for related with one in the carrier wave (or CIF) corresponding to N number of search space UE control channel.Thus, assuming that can be received with identical information size via any one of N number of search space Control channel candidate in the case of, UE monitoring control channels are candidate.In the case, using CIF (multi-carrier indicator field) Value is candidate come the control channel for distinguishing information size having the same.

On the contrary, if control channel candidate for each search space have different information sizes, can only via with Corresponding carriers (or CIF) corresponding search spaces receives the control channel for particular UE.That is, only via corresponding with CIF It is candidate that one search space sends the control channel with identical CIF.

Figure 11 A show the example of composition search space according to the embodiment of the present invention.In this example, to three DL CC carries out polymerization and the sending mode of DL CC is arranged to 1,3 and 4.For convenience, it is assumed that the bandwidth of whole CC is all Identical and DL CC#1 are PDCCH monitoring DL CC.Although it is phase to be directed to each DCI format in this example and execute the number of BD Same (similar with LTE system, BD are executed for six PDCCH candidates), but the number for executing BD can become according to DCI format Change.

1A referring to Fig.1, BS constitute search space for every CC and compare the DCI format size for whole CC.Make Size for the result of the comparison, the DCI format 1A for three DL CC is identical and DCI format 1, DCI format 2A and DCI format 2 is respectively provided with different size.Therefore, uniformly for three search spaces of DCI format 1A, (search space is total by BS It enjoys).Therefore, BS can via for DL CC#1 search space, for the search space of DL CC#2 and for DL CC#3's The PDCCH candidates of any one of search space send DCI format 1A (CIF=DL CC#1).It similarly, can be via three The PDCCH candidates of any one of a search space send DCI format 1A (CIF=DL CC#2) and DCI format 1A (CIF= DL CC#3).That is, it is candidate to send DCI format 1A via any one of the search space for DL CC#1, #2 and #3 (CIF=DL CC#1, #2 or #3).Thus, assuming that can be via any one in the search space for DL CC#1, #2 and #3 In the case of a reception DCI format 1A candidate (CIF=DL CC#1, #2 or #3), it is candidate that UE monitors PDCCH.In the case, It is candidate that DCI format 1A is distinguished using CIF value.

Conversely, because DCI format 1,2A and 2 are respectively provided with unique size, it is accordingly used in the search of DCI format 1,2A and 2 Space is not shared and is managed for every CC.That is, can only be sent via search space corresponding with DL CC#1 DCI format 1 (CIF=DL CC#1).Similarly, can only come respectively via search space corresponding with DL CC#2 and DL CC#3 Send DCI format 2A (CIF=DL CC#2) and DCI format 2 (CIF=DL CC#3).

The situation that will consider that maximum BD number (MaxBD) may be limited is described below in detail.MaxBD=36 is indicated and is shared It is compared before search space, the number for executing BD is not reduced.In the case of MaxBD=36, can via including unified and The search space of a PDCCH candidates of 18 (=6x3) of the search space of extension executes the BD for DCI format 1A jointly.On the contrary, The BD for DCI format 1,2A and 2 is executed via the search space including six PDCCH candidates.

If MaxBD is reduced to 24, the number that BD is executed for each DCI format must be reduced.If it is assumed that being directed to The number that each DCI format executes BD remains unchanged, then the number for being directed to each DCI format execution BD is reduced to 4 (=24/ 6).In the case, it can be made of 12 PDCCH candidates for the search space of DCI format 1A and be used for DCI format 1,2A The search space of each with 2 can be made of four PDCCH candidates.Similarly, it in the case of MaxBD=18, uses In the quantity of the PDCCH candidates of DCI format 1A can be 9 and for DCI format 1,2A and 2 the search space of each It may each comprise three PDCCH candidates.

Figure 11 B show to execute the example of PDCCH transmission and BD in the case where search space is shared.For convenient mesh , it is assumed that constitute search space corresponding with three carrier wave (CIF).It each search space can be with the DL CC-UL CC that link It is corresponding to any one of, DL CC or UL CC.In the accompanying drawings, it is assumed that the size of three search spaces can be different simultaneously And the CCE polymerization grades of PDCCH candidates can be different in each search space.For example, the search space for CC#1 can With CCE polymerization grades 1, and the search space for CC#2/#3 can have CCE polymerization grades 2,4 or 8.In the accompanying drawings, PDCCH (or PDCCH is candidate) (CIF=CC#X) (X=l, 2,3) can DCI format having the same or different DCI formats.

The case where Figure 11 B 1, shows the case where shared whole search spaces.That is, the search space for CC#1 to CC#3 The candidate DCI Payloads sizes having the same of PDCCH.Added whole search spaces due to shared, can via for The PDCCH candidates of any one of the search space that every CC is constituted send PDCCH.That is, can be via for every CC structures At any one of search space send PDCCH candidates.With reference to attached drawing, via the search space transmission for CC#1 PDCCH (CIF=CC#2), and PDCCH (CIF=CC#1) and PDCCH (CIF=can be sent via the search space for CC#2 CC#3).Therefore, assuming that can be via the search space for CC#1, the search space for CC#2 or the search for CC#3 In the case that space sends PDCCH (or PDCCH is candidate) (CIF=CC#X) (X=l, 2,3), UE, which is directed to, is used for CC#1 to CC#3 The PDCCH candidates of search space execute BD, to find PDCCH (CIF=CC#X) (X=l, 2,3).

The case where Figure 11 B 2, shows the case where partly sharing search space.For convenience, it is assumed that shared to use In the search space of CC#l/CC#3.That is, the candidate DCI having the same of the PDCCH of the search space for CC#1/CC#3 are effective Payload, and it is candidate different from the PDCCH of the search space for CC#1/CC#3, it is used for the search space of CC#2 PDCCH candidates have different DCI Payload sizes.It, can be via shared any one of search space with reference to attached drawing Send PDCCH (or PDCCH is candidate) (CIF=CC#3).Therefore, assuming that the search space for CC#1 can be transmitted or be used for In the case that the search space of CC#3 sends PDCCH (or PDCCH is candidate) (CIF=CC#3), UE is just for for CC#1/CC#3 Search space PDCCH candidates execute BD.On the contrary, in order to confirm PDCCH (CIF=CC#2), UE is just for for CC#2's The PDCCH candidates of search space execute BD.

Figure 12 show with Figure 11 A under the same conditions in the case where the sending mode of DL CC is arranged to 1,1 and 4 The method for constituting PDCCH search space.

2, BS constitutes the search space for every CC and compares the DCI format size for whole CC referring to Fig.1.Make For the result of the comparison, the size of the DCI format 1A for three DL CC is identical, is used for the DCI format 1 of two CC Size is identical, and only DCI format 2 has different sizes.Therefore, BS is uniformly searched for three of DCI format 1A Rope space and two search spaces for being uniformly used for DCI format 1A.Therefore, BS can via for DL CC#1 search space, The PDCCH candidates of any one of search space for the search space of DL CC#2 and for DL CC#3 send DCI format 1A (CIF=DL CC#1).Similarly, BS can be via the search space for DL CC#1 and searching for DL CC#2 The PDCCH candidates in any one of rope space send DCI format 1 (CIF=DL CC#X) (X=l, 2).Conversely, because DCI format 2 have unique size, the search space for being accordingly used in DCI format 2 be not shared and on the basis of every CC and It is managed.That is, DCI format 2 (CIF=DL CC#3) can be sent via the search space for being individually used for DL CC#3.

The maximum quantity MaxBD for the number for considering to execute BD is described in more detail.The MaxBD=36 the case where Under, similar with the example of Figure 11 A, the search space for the BD of DCI format 1A includes a PDCCH of 18 (=6x3) candidate.DCI The search space of format 1 may include the search of a PDCCH candidates of the 12 (=6x2) in unified expanded search space and DCI format 2 Space may include 6 PDCCH candidates.If MaxBD is reduced to 24, time that BD is executed for each DCI format must be reduced Number.If it is assumed that the number for executing BD for each DCI format remains unchanged, then the number that each DCI format executes BD is directed to It is reduced to 4.In the case, the search space for being used for DCI format 1A, 1 and 2 can be respectively by 12,8 and 4 PDCCH candidates Composition.Similarly, in the case of MaxBD=18, the quantity of the PDCCH candidates for DCI format 1A, 1 and 2 can be respectively 9,6 and 3.

Figure 13 shows to constitute another example of PDCCH search space.Although showing only one in Figure 11 to Figure 12 A DL CC are configured to PDCCH monitoring DL CC, but multiple DL CC can be configured to PDCCH monitoring DL CC groups.If The quantity that PDCCH monitors CC in DL CC groups is L, then as shown in figure 13, can apply such method, that is, limits (MaxBD)/L It is made as allowing number for the maximum that each monitoring CC executes BD or different weights is applied to monitoring CC (for example, anchor DL CC) the method for (that is, limitation allows number for each monitoring CC maximums for executing BD in different ways).According to monitoring CC Quantity constitute search space method can be pre-set by BS or can according to MaxBD limit and be arranged automatically by UE.

According to this method, if when CC is dispatched in the presence of the DCI (format) with same size, can be with DCI (lattice Formula) quantity be proportionally arranged monitoring DL CC on for DCI (format) search space size.It is thus possible to improve PDCCH scheduling degree of freedom and can solve PDCCH obstruction.

Embodiment 2：The search space of PDCCH for being dispatched across CC reduces

For convenience, by the specific CC transmissions by executing assignment of resources for the data channel of corresponding CC PDCCH is defined as from CC PDCCH, and the PDCCH for assignment of resources being executed for the data channel of the CC other than corresponding CC It is defined as across CC PDCCH.In the case, the BD in order to reduce on specific CC and preferably on PDCCH monitoring DL CC Number, for from the search space of CC PDCCH and for that can reduce across both search spaces of CC PDCCH.Preferably, it is used for Across the search space of CC PDCCH than for reducing more from the search space of CC PDCCH.Alternatively, it is used for from CC The search space of PDCCH can not reduce and be used to reduce across the search space of CC PDCCH.

Hereinafter, it is described in more detail with reference to the accompanying drawings.For convenience, in following attached drawing, It is only used for reducing across the search space of CC PDCCH for from the search space of CC PDCCH not reducing.However, this only shows Example property and following attached drawing and description can be applied to for from the search space of CC PDCCH and for across CC PDCCH's The case where search space all reduces, for across the search space of CC PDCCH than for reducing from the search space of CC PDCCH More situations etc..

Figure 14 is shown in the state of having polymerize 3 DL CC, in the case where the sending mode of DL CC is 1,3 and 4 Constitute the example of PDCCH search space.For convenience, it is assumed that the bandwidth of whole CC is all identical and by DL CC# 1 is arranged to PDCCH monitoring DL CC.

Referring to Fig.1 4, the size of the DCI format 1A for 3 CC is identical and DCI format 1,2A and 2 are respectively provided with Unique size.Therefore, the search space for DCI format 1A can be shared.In the accompanying drawings, MaxBD=36 indicates to execute BD most Big number is not reduced.In the case, the number that BD is executed for each DCI format becomes 6 (=36/6) and is used for DCI format 1A, 1, the search space of 2A and 2 respectively include that 18 (=6x3) are a, 6,6 and 6 PDCCH candidates.On the contrary, such as Fruit MaxBD is reduced to 24, then is used to remain unchanged from the search space of CC PDCCH, and for the search across CC PDCCH Space can reduce.For example, from the size of the search space of CC PDCCH with for every CC (for example, non-monitored DL CC) across The ratio between size of search space of CC PDCCH can be arranged to 2:1.In the case, include from the search space of CC PDCCH 12 PDCCH are candidate and include 6 PDCCH candidates across the search space of CC PDCCH for each non-monitored CC.Therefore, Become 6 (=12/2) for the number of each DCI format execution BD of monitoring CC, and for every DCI of non-monitored CC The number that format executes BD becomes 3 (=6/2).In short, due to having used DCI format 1A, search space in 3 CC It is candidate including a PDCCH of in total 12 (=6+3+3).On the contrary, the DCI format 1 only used in DL CC#1 (monitoring) can have 6 A PDCCH is candidate, and can have 3 using DCI format 2A and DCI format 2 only in DL CC#2 and DL CC#3 (non-monitored) A PDCCH is candidate.

Figure 15 shows to be constituted in the case where the sending mode of DL CC is 1,1 and 4 according to condition same as figure 14 and use Example in the search space of the BD of PDCCH.For convenience, it is assumed that the bandwidth of whole CC is identical and by DL CC#1 is arranged to PDCCH monitoring DL CC.

The size of referring to Fig.1 5, the DCI format 1A for 3 CC are identical, the sizes of the DCI format 1 for 2 CC It is identical, and only DCI format 2 has unique size.Therefore, can share for DCI format 1A 3 search spaces simultaneously 2 search spaces for DCI format 1 can be shared.In the accompanying drawings, MaxBD=36 indicates that the maximum times for executing BD do not subtract It is few.In the case, the number that BD is executed for each DCI format becomes 6 (=36/6), and for DCI format 1A, 1 Search space with 2 respectively includes that 18 (=6x3) are a, 12 (=6x2) are a and 6 PDCCH candidates.On the contrary, if MaxBD is reduced To 24, then it is used to remain unchanged from the search space of CC PDCCH and for that across the search space of CC PDCCH can reduce. For example, the size from the search space of CC PDCCH and the searching across CC PDCCH for every CC (for example, non-monitored DL CC) The ratio between the size in rope space can be arranged to 2:1.In the case, include that 12 PDCCH are waited from the search space of CC PDCCH It selects and includes 6 PDCCH candidates across the search space of CC PDCCH for each non-monitored CC.Therefore, for monitoring CC Each DCI format execute the number of BD and become 6 (=12/2), and execute BD for each DCI format of non-monitored CC Number become 3 (=6/2).In short, due to having used DCI format 1A, search space to include in total 12 in 3 CC (=6+3+3) a PDCCH is candidate.Similarly, due to using DCI format 1, search space to include in total 9 in 2 CC (=6+3) a PDCCH is candidate.On the contrary, only can have 3 PDCCH candidates using DCI format 2 in DL CC#3 (non-monitored).

Embodiment 3：Information (for example, DCI) size is unified

In the method, in order to improve the degree of freedom of control channel scheduling, there will be different size of multiple control information (for example, DCI) format packets are to single size.That is, executable DCI sizes unified (or the matching of DCI sizes) are so that DCI format With same size.The matching of DCI sizes can be executed only in the case where the difference of DCI sizes is equal to or less than threshold value.For example, DCI Size matching can be executed only in the case where the difference of DCI sizes is equal to or less than 3 bit.Bit padding can be used to execute DCI big Small matching.Filling bit (stream) can have AD HOC or particular value (for example, 0).For example, filling bit (stream) can have instruction The value of DCI format or particular value for error checking.

If DCI (format) is grouped into single size, its search space can be shared, as tdescribed in embodiment 1.Cause This, can be with the quantity of the DCI (format) for being grouped into single size proportionally expanded search space.Use/unuse we The parameter of method and this method can be arranged for each UE, UE grouping or cell by BS, or can execute BD most It is arranged automatically by UE in number (MaxBD) permissible greatly.

Figure 16 be show if in the state of having polymerize 3 DL CC DL CC sending mode be 1,3 and 4, constitute The example of the search space of BD for PDCCH.Assuming that the bandwidth of DL CC#1 is equal with the bandwidth of DL CC#2, but and DL The bandwidth of CC#3 is different, and DL CC#1 are arranged to PDCCH monitoring DL CC.Therefore, 2 CC (DL CC#1 and DL are used for CC#2 the size of DCI format 1A) is identical (unified F1), and for the DCI format 1A (format 3-1A) of DL CC#3 It is respectively provided with unique size with DCI format 1,2A and 2.In the present example it is assumed that being arranged to for the matched threshold value of DCI sizes 3 bits.

Referring to Fig.1 6, if MaxBD is 36 bits, and it is not carried out bit padding, is then directed to each DCI format and executes The number of BD is 6, and for unified F1 (40 bit), format 3-1A (44 bit), format 1-1 (48 bit), format 2- The search space of 2A (53 bit) and format 3-2 (55 bit) respectively include 12 (=6x2) it is a, 6,6,6 and 6 PDCCH is candidate.On the contrary, if MaxBD is reduced to 24 and executes bit padding, meet fill conditions (that is, the size of DCI Difference be 3 bits or smaller) DCI format be format 2-2A and format 3-2 ((format 3-2：55 bits)-(format 2-2A：53 Bit)=2 bit<3 bits).Therefore, with 2 bit padding format 2-2A, and format 2-2A and format 3-2 are grouped into list One size (unified F2).Number due to executing BD for each DCI format is 4, it is used for unified F1, format 1- 1, the search space of unified F2 and format 3-1A can respectively include 8 (=4x2) it is a, 4,8 (=4x2) are a, 4 PDCCH are waited Choosing.As a result, 2 DCI (format 2-2A and format 3-2) are grouped into a size, search space that size is doubled into Row is shared, and the degree of freedom of DCI scheduling can be doubled generally.

Figure 16, which is shown, to be executed DCI sizes in the case where the maximum times MaxBD for executing BD is reduced unified (or DCI is big Small matching) the case where.However, this is merely exemplary and no matter whether MaxBD reduces the DCI sizes that can all apply the present invention Unified (or the matching of DCI sizes).

Even if the difference for being directed to three or more DCI sizes is equal to given threshold value or can if given threshold value DCI below To execute the matching of DCI sizes to be matched to single size.Multiple DCI groupings can be directed to and execute often grouping DCI sizes matching (example Such as, bit padding).In addition, independent format indicator (FI) bit is filled in order to prevent, DCI lattice are provided in DCI groupings The CC of formula can be exclusive.If can there are multiple DCI to be grouped, preferably for larger amt DCI format Grouping executes bit padding for the smaller grouping of the summation of the difference with maximum DCI format size.

In addition, if there is the DCI format that the CC for polymerization is arranged jointly, then DCI format is grouped for whole CC To single size, or whole CC can be directed to only by a part of DCI (preferably a, format) format packets to single size.Point Group includes to the operation of single size, for example, bit padding and dispatch the increase of granularity (scheduling granularity)/ It reduces.In the case, the grouping DCI format of CC can be shared through unified one obtained for the search space of DCI format A search space.In other words, the BD of the grouping DCI format for CC can be executed jointly in an expanded search space.For The quantity for the DCI format that the CC of polymerization is arranged jointly can be one or more.

Although having exemplified the case where applying the present invention to DL CC till now, will be described in now The method for considering to constitute PDCCH search space in the case of UL CC.Before describing, it should be noted that be directed to every DL/UL CC To the size of each search space constituted, DL CC or UL CC can be confirmed as with via the transmissible maximum number in search space Amount PDCCH is proportional, or can be given weight.For convenience, although according to transmission mould in following attached drawing Formula setting is directed to a DCI format of an every DL CC or UL CC, but multiple DCI formats (two or more) can be arranged. It is similar to the DCI format 0/lA of traditional LTE system, the public DCI formats of DL/UL can be set.

In the search space for considering DL/UL CC, [scheme 1] can be separately constructed for DL CC search space and For the search space of UL CC, or [scheme 2] can be directed to the DL/UL CC of each link to constituting a search space.

[scheme 1] is separately constructed the case where search space for DL CC and search space for UL CC

Figure 17 shows the asymmetric CC polymerization situations for having polymerize 3 DL CC and 2 UL CC.Referring to Fig.1 7, it can be independently Constitute the search space for the search space of each DL CC and for each UL CC.In the case, have regardless of DL/UL There is the DCI (format) of same size that can share search space corresponding with the CC as described in embodiment 1.In addition, in order to subtract Execute the number of BD less and increase scheduling freedom, embodiment 2 and embodiment 3 can together/be used alone.

[scheme 2] is directed to the case where DL/UL CC of each link are to constituting search space.

1) the DL/UL CC of each link are directed to constituting search space.It is different in the quantity of DL CC and the quantity of UL CC Asymmetric CC polymerization in the case of, non-link CC may make up the search space of an every DL CC or UL CC.As a result, what is constituted searches The sum in rope space can correspond to the greater in the sum of DL CC or the sum of UL CC.DL/UL with same size DCI (format) is shared with the CC as described in embodiment 1 to corresponding search space.In addition, in order to reduce time for executing BD Count and improve scheduling freedom, embodiment 2 and embodiment 3 can by together/be used alone.

1-a) symmetrical CC polymerization situations (that is, quantity of the quantity of DL CC=UL CC).For the DL/UL of each link CC is to constituting search space (referring to Figure 18).

1-b) the heavy CC of DL- (DL-heavy CC) polymerize situation (that is, the quantity of DL CC>The quantity of UL CC)：For every The DL/UL CC of one link are to constituting search space and being that every DL CC constitute search space (ginseng for the DL CC of non-link See Figure 19).

1-c) the heavy CC of UL- (UL-heavy CC) polymerize situation (that is, the quantity of DL CC<The quantity of UL CC)：For every The DL/UL CC of one link are to constituting search space and being that every UL CC constitute search space for the UL CC of non-link.

2) if the search space that the CC (DL or UL) for being directed to each non-link is constituted is A type SS, and is directed to each link DL/UL CC be Type B SS to the search space of composition, then the size of A types SS can be equal to or less than Type B SS size.

2-a) if it is assumed that no matter DL/UL can be scheduled for the most PDSCH/PUSCH of every CC, then such as Figure 20 institutes Show, since most PDSCH/PUSCH can be sent via A types SS (DL or UL are dispatched), and most two PDSCH (DL+UL scheduling) can be sent via Type B SS, therefore the size of A types SS and the ratio between the size of Type B SS can be arranged to 1:2.

3) no matter there is DL/UL the DCI format of same size to share unified search space as tdescribed in embodiment 1.

4) in order to reduce the number of BD and improve scheduling freedom, embodiment 2 and embodiment 3 can together/individually answer With.

Although in the present invention, for from PDCCH monitoring DL CC be dispatched to UE whole DL/UL CC across CC scheduling all It is possible, but across CC scheduling can also be arranged to execute for limited quantity DL/UL CC groupings.Across CC scheduling Setting can monitor DL CC according to PDCCH and change.If monitoring DL CC using multiple PDCCH, the DCI with same size (format) is shared in the correspondence search space on corresponding monitoring CC.If existed with same size between monitoring CC DCI (format), then can share corresponding search space.Search space can be shared between monitoring CC, dispatched across CC without limitation Setting.In order to reduce by BD number, the search space shared between the DCI (format) with same size can be further decreased Size.For example, if the size of multiple DCI (format) is identical, only some (one) is used for searching for DCI (format) Rope space can be assigned as the search space shared between DCI (format), or multiple space collectives for DCI (format) Reduce, to constitute a shared search space.Furthermore it is possible to proportional to the quantity of DCI (format) of shared additional space The ratio of the size of shared search space is arranged between the DCI (format) with same size in ground.

Emulation

PDCCH blocking probabilities are assessed in the case where applying or not applying the SS of the DCI format for same size shared. Emulation is provided in table 5 to assume.It is provided with the CCE polymerization grades dispatched in PDCCH also in table 6 and is distributed (%).

【Table 5】

【Table 6】

1 CCE	2 CCE	4 CCE	8 CCE
				56	29	12	3

Figure 21 and Figure 22 show when for every UE polymerize 2 CC, and the BW of PDCCH CC be respectively 10MHz, The PDCCH blocking probabilities shared according to SS when 20MHz.As shown, observation obtains：Compared with the situation that no SS shares, lead to Whole PDCCH blocking probabilities can be substantially reduced and (reduce 25% and 33% respectively in 10MHz and 20MHz using SS is shared by crossing More than).

Figure 23 is the figure for showing can be applied to the base station of embodiments of the present invention and user equipment.

With reference to Figure 23, wireless communication system includes base station (BS) 110 and user equipment (UE) 120.Base station 110 includes：Place Manage device 112, memory 114 and radio frequency (RF) unit 116.Processor 112 can be configured as realizing the mistake proposed in the present invention Journey and/or method.Memory 114 is connected with processor 112 and stores various types related with the operation of processor 112 Information.RF units 116 are connected with processor 112 and send and/or receive radio signal.User equipment 120 includes： Processor 122, memory 124 and radio frequency (RF) unit 126.Processor 122 can be configured as what realization proposed in the present invention Process and/or method.Memory 124 is connected with processor 122 and stores related with the operation of processor 122 various types of The information of type.RF units 126 are connected with processor 122 and send and/or receive radio signal.Base station 110 and/or use Family equipment 120 can have single antenna or multiple antennas.

The structural element and feature of the present invention are combined by a predefined manner, realizes the above embodiment.Unless another It is described, otherwise should selectively consider each structural element or feature.Each structural element or feature can not be with other Structural element or feature are realized in combination.In addition, certain structural elements and/or feature can be combined with each other, to constitute this hair Bright embodiment.The sequence of the operation described in embodiments of the present invention can be changed.Certain portions of one embodiment Part or feature may include in another embodiment, or can use another embodiment corresponding construction element or spy It levies to replace.It is further obvious that refer to specific rights requirement certain claims can with refer in addition to this is specific Other claim combinations of other claims other than claim are together to constitute the embodiment, or are carrying Increase new claim by modification after handing over the application.

Embodiments of the present invention are described based on the data transmission and reception between base station and user equipment.It is retouched Stating can according to circumstances be executed by the upper layer node of base station for the specific operation executed by base station.In other words, it will be apparent that, It is performed for the various operations that include user equipment communication in the network together with multiple network nodes of base station Other network nodes that can be by base station or other than base station execute.Such as fixed station, Node B, eNode B can be used in base station (eNB) it is replaced with the term of access point (AP).In addition, such as movement station (MS) and mobile subscriber station (MSS) can be used in user equipment Term replace.

It can be realized according to the embodiment of the present invention by various means, for example, hardware, firmware, software or its is any It combines to realize.If realized according to the embodiment of the present invention by hardware, the method for embodiments of the present invention can Pass through one or more application-specific integrated circuits (ASIC), digital signal processor (DSP), digital signal processing appts (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, Wei Chu Device etc. is managed to realize.

If realized according to the embodiment of the present invention by firmware or software, embodiments of the present invention can lead to It crosses and executes a kind of module, process or the function of above-mentioned functions or operations to realize.Software code can be stored in memory cell Then it can be driven by processor.Memory cell can be located inside or outside processor, with by various any means knowns to processing Device transmission data receives data from processor.

To those skilled in the art it will be apparent that, do not depart from the present invention spirit and essential characteristics the case where Under, the present invention can be embodied according to other particular forms.Thus, above description should be interpreted that be to show in all respects Meaning property, and not restrictive.The scope of the present invention should be determined by the reasonable dismissal of appended claims, be fallen in present invention etc. All changes in co-extensive are intended to be included within.

Industrial Applicability A

The present invention can be used for such as user equipment, relay station, base station wireless communication device in.

Claims

1. receiving control channel at a kind of user equipment configured with multi-carrier indicator field CIF in a wireless communication system Method, this approach includes the following steps：

Receive include the specific search spaces multiple UE subframe, wherein each of specific search spaces the multiple UE with by phase The corresponding component carrier for the CIF value instruction answered is corresponding；And

It is candidate to monitor control channel in the specific search spaces the multiple UE, wherein the control channel candidate and be directed to down Two or more CIF value of downlink control information DCI format size are corresponding,

Wherein, corresponding with any CIF value in the two or more CIF value for the DCI format size One in the control channel candidate with the DCI format size is monitored in any specific search spaces UE.

2. according to the method described in claim 1, wherein, each of described control channel candidate further includes being identified symbol scrambler Cyclic redundancy check (CRC).

3. according to the method described in claim 2, wherein, the identifier includes Cell Radio Network Temporary Identifier/Identity, Cell-RNTI symbol C- RNTI。

4. according to the method described in claim 1, wherein, the first control channel candidate is distinguished using the CIF value.

5. a kind of sending method of the base station in wireless communication system, this approach includes the following steps：

It is candidate to generate control channel, wherein each of described control channel candidate includes corresponding multi-carrier indicator field CIF Value；And

The control channel candidate is sent via the specific search spaces multiple UE in subframe,

Wherein, the control channel candidate is corresponding with for two or more CIF value of DCI format size,

6. according to the method described in claim 5, wherein, each of described control channel candidate further includes being identified symbol scrambler Cyclic redundancy check (CRC).

7. according to the method described in claim 6, wherein, the identifier includes Cell Radio Network Temporary Identifier/Identity, Cell-RNTI symbol C- RNTI。

8. according to the method described in claim 5, wherein, the first control channel candidate is distinguished using the CIF value.

9. a kind of user equipment configured with multi-carrier indicator field CIF for operating in a wireless communication system, the user Equipment includes：

Radio frequency unit；And

Processor,

Wherein, the processor is configured as the subframe that reception includes the specific search spaces multiple UE, is searched wherein the UE is specific Each of rope space and the corresponding component carrier indicated by corresponding CIF value are corresponding；And

10. user equipment according to claim 9, wherein each of described control channel candidate further includes being identified Accord with the cyclic redundancy check (CRC) of scrambler.

11. user equipment according to claim 10, wherein the identifier includes Cell Radio Network Temporary Identifier/Identity, Cell-RNTI symbol C-RNTI。

12. user equipment according to claim 9, wherein distinguish control channel candidate using the CIF value.

13. a kind of base station in a wireless communication system, which includes：

Radio frequency unit；And

Processor,

Wherein, the processor is configurable to generate control channel candidate, wherein each of described control channel candidate includes Corresponding multi-carrier indicator field CIF value, and

Wherein, the control channel candidate and two or more CIF value for being directed to down link control information DCI format size It is corresponding,

14. base station according to claim 13, wherein each of described control channel candidate further includes being identified symbol to disturb The cyclic redundancy check (CRC) of code.

15. base station according to claim 14, wherein the identifier includes Cell Radio Network Temporary Identifier/Identity, Cell-RNTI symbol C- RNTI。

16. base station according to claim 13, wherein distinguish control channel candidate using the CIF value.